You have to a design a flexible highway pavement with soaked CBR value of soil subgrade...

You have to a design a flexible highway pavement with soaked CBR value of soil subgrade equal to 4%. Draw a typical cross-section of the pavement as considered currently worldwide.

Expert Solution

Consider the following example of design

Design the pavement for construction of a new bypass with the following data:
1. Two lane carriage way
2. Initial traffic in the year of completion of construction = 400 CVPD (sum of both directions)
3. Traffic growth rate = 7.5 %
4. Design life = 15 years
5. Vehicle damage factor based on axle load survey = 2.5 standard axle per commercial vehicle
6. Design CBR of subgrade soil = 4%.
Solution
1. Distribution factor = 0.75
2.
N =
365 ×
-

(1 + 0.075)15 − 1)
0.075
× 400 × 0.75 × 2.5
= 7200000
= 7.2 msa
3. Total pavement thickness for CBR 4% and traffic 7.2 msa from IRC:37 2001 chart1 = 660 mm
4. Pavement composition can be obtained by interpolation from Pavement Design Catalogue (IRC:37 2001).
(a) Bituminous surfacing = 25 mm SDBC + 70 mm DBM
(b) Road-base = 250 mm WBM
(c) sub-base = 315 mm granular material of CBR not less than 30 %

Ally Wells answered 6 months ago

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